B1279

DTC Troubleshooting: B1279

DTC B1279:

Headlight Switch Dimmer Position Circuit Malfunction

NOTE: If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A Troubleshooting - B-CAN System Diagnosis Test Mode A.

1. Clear the DTCs with the HDS.

2. Turn the ignition switch to LOCK (0) and then back to ON (II).

3. Turn the headlight switch ON.

4. Change the DIMMER switch from low beam to high beam and wait for 2 seconds.

5. Pull and hold the combination light switch lever, and hold the passing switch position for more than 2 seconds.

6. Check for DTCs with the HDS.

Is DTC B1279 indicated?

YES -

Go to step 7.

NO -

Intermittent failure, the headlight switch DIMMER circuit is OK at this time. Check for loose or poor connections.�

7. Turn the ignition switch to LOCK (0).

8. Disconnect the combination light switch 12P connector from the wiper/washer switch.

9. Do the combination light switch test Service and Repair and check for open or short in the combination light switch terminals in each switch position.

Is the combination light switch OK?

YES -

Faulty combination switch control unit, replace the wiper/washer switch Service and Repair.�

NO -

Replace the combination light switch Service and Repair.�